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// Portions Copyright [2018] Payara Foundation and/or affiliates

package com.sun.enterprise.management.support;


import java.util.Map;
import java.util.HashMap;
import java.util.Collections;

/**
 * See also com.sun.enterprise.management.support.SystemInfoImpl
 *
 * @see com.sun.appserv.management.base.SystemInfo
 * @see com.sun.enterprise.management.support.SystemInfoImpl
 */
public final class SystemInfoData {
    
    private static final SystemInfoData INSTANCE = new SystemInfoData();
    
    private final Map<String,Long>      mPerformanceMillis;
    private final Map<String,Long>      mUnmodifiablePerformanceMillis;
    
    private SystemInfoData() {
        mPerformanceMillis  = Collections.synchronizedMap( new HashMap<String,Long>() );
        mUnmodifiablePerformanceMillis  = Collections.unmodifiableMap( mPerformanceMillis );
    }
    
    public static SystemInfoData getInstance() {
        return INSTANCE;
    }
    
    /**
     * Add a performance metric.
     * @param name
     * @param millis
     */
    public synchronized void addPerformanceMillis(final String name, final long millis) {
        if (mPerformanceMillis.containsKey(name)) {
            throw new IllegalStateException();
        }
        mPerformanceMillis.put(name, millis);
    }
    
    /**
     * @return unmodifiable Map of performance data
     */
    public Map<String, Long> getPerformanceMillis() {
        return mUnmodifiablePerformanceMillis;
    }
}

